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Questions and Answers
What structures form the skeletal and soft tissue framework of the thorax?
What structures form the skeletal and soft tissue framework of the thorax?
- 12 pairs of ribs, costal cartilages, thoracic vertebrae, intercostal muscles, sternum (correct)
- 8 pairs of ribs, thoracic vertebrae, abdominal muscles, scapula, manubrium
- 10 pairs of ribs, xiphoid process, cervical vertebrae, diaphragm, trapezius muscles
- 7 pairs of ribs, costal cartilages, lumbar vertebrae, pectoral muscles, clavicle
What muscle separates the thoracic cavity from the abdomen?
What muscle separates the thoracic cavity from the abdomen?
- Rectus abdominis
- Diaphragm (correct)
- Pectoralis major
- External intercostal muscles
Which part of a typical rib articulates with the corresponding vertebra and one above?
Which part of a typical rib articulates with the corresponding vertebra and one above?
- Shaft
- Neck
- Head (correct)
- Costal groove
What is the function of the thoracic cage?
What is the function of the thoracic cage?
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Which structures participate in forming the boundaries of the thorax?
Which structures participate in forming the boundaries of the thorax?
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Study Notes
Thoracic Framework
- The thorax consists of bones, cartilage, and muscles that create both a skeletal and a soft tissue framework.
- Key components include the sternum, ribs, thoracic vertebrae, and associated cartilage.
Diaphragm Role
- The diaphragm is a dome-shaped muscle that separates the thoracic cavity from the abdomen.
- Plays a crucial role in respiration by contracting and relaxing to facilitate breathing.
Rib Articulation
- The head of a typical rib articulates with the corresponding vertebra as well as the vertebra above it.
- This dual articulation allows for stability and flexibility of the rib cage.
Function of Thoracic Cage
- The thoracic cage protects vital organs such as the heart and lungs.
- Provides structural support and anchorage for muscles involved in respiration, movement, and the upper limbs.
Boundaries of the Thorax
- The thorax is enclosed by several structures, including the ribs, sternum, and thoracic vertebrae.
- The diaphragm forms the inferior boundary, while the upper boundary includes the thoracic inlet.
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